1The unit of length "metre" (meter), symbolized "m"; the base unit for kilometre, centimetre, and so on.
このプールの長さは25メートルだ。
This pool is 25 metres long.
山頂までまだ500メートルほど登らなければならない。
We still have to climb about 500 more metres to reach the summit.
100メートル走のタイムを計った。
I timed myself running the 100 metres.
この道路の幅は約10メートルある。
This road is about 10 metres wide.
2This can also mean a measuring gauge or meter, but in that sense it is almost always written as "meter" (メーター) instead — the spelling "metre" (メートル) is essentially never used for this meaning.